If three bodies sun, earth and moon are situated in a
straight line, at the time of the moon entering the shadow
cone the moon will be totally obscured, thereby giving a
total lunar eclipse. If they are slightly out of line, only
a part of moon enters the umbrral cone and a partial lunar
eclipse occurs. This o curs at full moon when moon enters
that shadow of the earth, as cast by the earth.
At new moon, earth may pass through moon?s shadow so that
parts of the sun will be obscured to the eyes on the earth.
Earth e being much bigger than moon, whole of it cannot pass
through the umbra. But as the points on the earth will fall
within this umbra, a total solar eclipse occurs. At places
which pass through penumbra, a partial solar eclipse occurs.
Eclipses do not occur regularly even though the
earth comes between the moon and the sun at every full moon.
It is because of two reasons:-
(1) The moon?s obit is inclined to that of earth at an angle
of about 50 .
(2) The earth?s orbit being elliptical, the distance of the
earth from the sun is different at different positions of
the orbit, due to which the size of the shadow changes.
3. What is Astronomical telescope?
It consist of two convex lenses. These lenses are called
object glass and eye piece respectively. A real, inverted
and diminished object is formally the object at its focus.
This image lies with the focus of the eye piece which acts
as a magnifying galss, producing a virtual, erect, enlarged
image of it. The first image this seen is magnified, but
inverted with respect to the object.
Magnigying power = F/f
Where F is focal length of object glass, and f is focal
length of eye-piece.
In 1886 Eugen Goldstein discovered canal rays (also known as
anode rays) and showed that they were positively charged
particles (ions) produced from gases. Menas,originally
Goldstein postulated that there were some positively charged
particles... but he didn't say that they were Protons!!
Following the discovery of the atomic nucleus by Ernest
Rutherford in 1911. This was confirmed experimentally by
Henry Moseley in 1913 using X-ray spectra. In 1919
Rutherford proved that the hydrogen nucleus is present in
other nuclei, a result usually described as the discovery of
the proton.
chandrayan is a satellite which is discover on the moon i.e.
it is for finding the live on the moon
Objectives of Chandrayan were:
1. To design, develop, launch and orbit a spacecraft around
the Moon using an Indian-made launch vehicle.
2. To conduct scientific experiments using instruments on
the spacecraft which would yield data:
for the preparation of a three-dimensional atlas (with
high spatial and altitude resolution of 5-10 m) of both the
near and far side of the Moon,
for chemical and mineralogical mapping of the entire
lunar surface at high spatial resolution, mapping
particularly the chemical elements magnesium, aluminium,
silicon, calcium, iron, titanium, radon, uranium, and thorium,
to increase the scientific knowledge
to test the impact of a sub-satellite (Moon Impact Probe
- MIP) on the surface on the Moon as a fore-runner to future
soft-landing missions
SETI (Search for Extra-Terrestrial Intelligence) is branch
of Astro Physics which searches for the same which you asked!
Search for Extra-Terrestrial Intelligence (SETI) is the
collective name for a number of activities people undertake
to search for intelligent extraterrestrial life. SETI
projects use scientific methods to search for
electromagnetic transmissions from civilizations on distant
planets.
There is one more such name: NTI - Non-Terrestrial
Intelligence... means this intelligence doesn't live on
Earth/Land... It may lie beneath the oceans!!
7. WHAT ARE THE FORCES WHICH KEEP A FLYING PLANE IN A EQUILIBRIUM?
for level flight lift is balanced by weight and thrust is
balanced by drag, hence then whole system become stable
w.r.t to force and for moments , inherently stable aircraft
are designed in a way that the pitching moment is balanced
by horizontal stabilizer , elevator may be deflected for
trim at certain velocities where i'm not changing the moment
curve slope , and for roll and yaw stability both aileron
and rudder may be used as they are cross coupled. Aids in
roll and yaw stability may be provided by high wing, sweep
back, dihedral wings etc
8. How many planets are found till now?
eight;
Pluto isn't considered a planet any more.
9. Why we feel sky blue in color?
The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky.
Whichever direction you look, some of this scattered blue light reaches you.
Since you see the blue light from everywhere overhead, the sky looks blue.
10. Explain Shape of the earth?
Shape and size of the earth. The shape of the earth is
regarded as a sphere , but it is actually an oblate spheroid
like as egg being slightly flattered at the poles
